developer

A software-development guide for adding features, designing behavior, writing tests, improving interfaces, documenting architecture, and following commit and pull-request rules. It also explains terms such as TDD (writing tests before code), BDD (describing behavior through examples), DDD (designing around business concepts), and XP (a set of collaborative development practices).

In plain words
What is it for?
Use it when implementing features, writing tests, working on user interfaces, updating architecture or glossary documents, committing code, or opening pull requests.
Why use it?
It gives the agent a consistent way to plan, build, test, document, and submit changes instead of handling each step differently. It also keeps project documents and naming aligned as the code changes.

Skill for Claude CodeCodexCursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/felixzhu97/explore-chat/developer
Any agent
npx skills add felixzhu97/explore-chat --skill developer
Clone the repo
git clone --depth 1 https://github.com/felixzhu97/explore-chat

Made for: Claude Code, Codex, Cursor.

Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,756 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00091 $0.03756
Opus 5 $0.00046 $0.01878
Sonnet 5 $0.00018 $0.00751
Haiku 4.5 $0.00009 $0.00376

Measured 2d ago against content hash dd31b8e97a5f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/skills/developer/SKILL.md · 264 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 264 lines · 91 tokens per session scan A dd31b8e97a5f

Subscribe to this mod's changes

developer is a skill published in the GitHub repository felixzhu97/explore-chat (5 stars, last pushed 17d ago), with no licence file. It adds 91 tokens to every session and 3,756 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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Project architecture and file structure conventions for all process types. Use when: (1) Creating new files or modules, (2) Deciding where code should go, (3) Converting single-file components to directories, (4) Reviewing code for structure compliance, (5) Adding new bridges, services, agents, or workers.

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